Telephone-switch



(No Model;

J; D.- LYLE.

TELEPHONE SWITCH.

No. 309,791. Patented Dec. 23, 1884.

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UNITED STATES PATENT OFFICE.

JOHN D. LYLE, OF COLUMBUS, INDIANA.

TELEPHONE-SWITCH.

SPECIFICATION forming part of Letters Patent No. 309,791, dated December 23, 1884.

Application filed July 10, 1884. (No model.)

To all whom it may concern:

Be it known that I, JOHN D. LYLE, a citizen of the United States, residing at Columbus, in the county of Bartholomew and State of Indiana, have invented certain new and useful Improvements in Telephone-Switches; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention consists of a switch for telephone stations, composed of a fixed hook adapted to hold the telephone-receiver, and a sliding spring -actuated commutator which projects into said hook.

In order that my invention maybe clearly understood, 1 have illustrated in the annexed drawings,and will proceed to describe, a practical form thereof, and a mode of applying it to a local telephone-station.

Figure 1 is a perspective view of my in1- proved switch for telephones. Fig. 2 is adiagram illustrating a mode of applying such a switch to a terminal local telephone-station.

The same letters of reference indicate identical parts in all the figures.

The sliding commutator A, mounted on a suitable board, A, is in permanent electrical connection with the contactspring F, with which the line-wire L is connected. It is provided with a contact-point,b,adapted to make contact with contact-spring B, which is connected with one side of the bell-magnet, the other side of which is connected to earth. The commutator is provided with three other contact-points, c d 6, adapted to simultaneously make contact with the contact-springs O, D, and E, respectively. Oontact spring O is connected with one end of the secondary coil of the inductorium I, the other end of said coil being connected with one side of the electro-magnet of the receiver R, the other side of which is connected to earth. Contactsprings D and E are the terminals of the inductoriums primary circuit, which includes the transmitter T. The commutator is arranged to slide on a couple of studs which pass through longitudinal slots in the commutator, as clearly shown. holds the commutator in the position shown in the drawings, so that one end of it is projected into the hook H when the receiver is detached from the said hook. In that position of the commutator it is in electrical connection with the contact-springs O D E, so that the primary circuit of the inductorium is closed and its secondary coil put in the linecircuit, the connection between the commutator and contact-spring B being broken, so as to cut out the bell-magnet.

In placing the receiver in hook H the com mutator is pushed back, and its points 0 d 0 break from the contact-springs O D E, while its point b makes contact with contact-spring B, putting the bell-magnet in the line-circuit.

I am aware that telephone-switches are known in which a switch-lever is so arranged with reference to a fixed hook for supporting the telephone that said telephone cannot be taken from the hook or replaced upon it without turning the switch-lever and changing the circuit-connections; but I believe that I am the first to construct a telephone-switch with a sliding spring-actuated bar which is projected by its spring into the supporting-hook when the telephone is detached, and pushed back by the telephone in placing it in the hook.

I claim as my invention- The combination, substantially as before set forth, of the fixed hook for supporting a telephone-receiver, and the sliding spring-actuated commutator projecting into said hook.

In testimony whereof I afiix my signature in 8 presence of two witnesses.

JOHN D. LYLE. Witnesses:

D. W. ADAMS, D. NEWsoM.

A spring, G, 

